Improvement in scroll-saws



UNITED STATES PATENT OFFICE.

ABRAM BEEKMAN, OF NEW YORK, N. Y.

IMPROVEMENT IN SCROLL-SAWS.

Speciiication forming part of Letters Patent No. 39,1 90, datedSepernber 8, 1863,

To all whom it may concern.:

Be it known that I, AERAM BEEKMAN, of the city, county, and State of NewYork, have invented a new and Improved ScrollSawing Machine; and I dohereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, makin ga part of this speciiication, in which- Figure l is aside sectional view of my in- `vention, taken in the line w, Fig.2, Fig.2, a plan or top view of the same.

Similar letters of reference indicate corresponding parts in the twofigures.

This invention relates to a new and improved sawing-machine, such as aredesigned for sawing scroll-work; and it consists in attaching the endsof the saw to rocking-arms, which are connected to the ends ot' anoscillating beam or frame, all being arranged in such a manner that thesaw will have a vertical movement, and by an exceedingly simple andeconomical means.

To enable those skilled in the art to fully understand and construct myinvention I will proceed to describe it.

' A representsa framing, which may be constructed in any proper manner,to support a horizontal bed-piece, B, on which the stut to be sawed isplaced, and O represents a beam or frame, which is secured on arock-shaft, D, a trifle above the bed-piece B, at one end of it. Thisbeam or frame() is ot' U shape, and it has one arm, a, above thebed-piece B, and the other arm, a', below it, as shown in Fig. l.

To the front end of the arm ct of the beam or frame O there is attached,by a pin or pivot, b, a rocker, D, the t'ront edge ot' which is ofcurved form, and the lower end of this rocker has a bar, E, attached toit by a joint or hinge, c, the back end of said bar being attached by ajoint or hinge, d, to an upright, F, secured to the framing A, saidupright passing through an oblong slot in the arm a, to serve as a guidefor the beam or frame C. The front end of the lower arm, a', of the beamor frame O also has a rocker G attached to it, similar to the rocker I).The rocker G at its upper end has a bar, H, attached to it by a joint orhinge, c, the back end of said bar being connected by la joint or hinge,f, to a pendant, I, attached to the under side of the bed-piece B, saidpendant passing through an oblong slot in the arm a', and also servingas a guide to the beam or frame C.

J represents the saw, thelower end of which is attached, by a metalstrap, g, to the rocker G, as shown at h. (See Fig. l.) The upper end ofthe saw J is attached by a metal strap, t', to a rack, j, which isfitted in the upper rocker, D, and has a pinion, le, gearing into it,the shaft l of which has a crank, m, attached at one end. (See Fig. 2.)The saw J is strained to the proper degree of tension by turning thecrank m, and the rack is held at the desiredpoint by means of a pindriven into one side of the rocker D, so as to serve as a stop for thecrank m. Other fastenings, however, for this purpose may be employed.The saw J works through a slot, a, in the bedpiece B. In the lower partof the framing A there is fitted a driving-shaft, K, on the inner endot' which there is secured a crank-pulley, L, to which the lower end ofa pitman, M, is connected, the upper end of said pitman being attachedto the front end ot' the arm c of the beam or frame O.

From the above description it will be seen that when the shaft K isrotated an oscillating motion will be communicated to the beam or frame(l through the medium of the crank-pulley L and pitman M, and that thesaw J will work in a vertical line, the rockers D G compensating for thecurvilinear movement of the beam or frame O. The rockers D G, inconsequence of being connected by the bars E H to the iiXed parts F I,are moved as the beam or frame() is oscillated, to effect this resultthe upper part of the rocker D being thrown outward or forward as thearm a dcscends, and thrown backward as it ascends, while the lowerrocker, G, has a similar movement imparted to it by its bar H. Thus, bythis simple arrangement, a very compact and economicalscroll-sawingniachine is obtained.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The oscillatingbeam or frame C, in combination with the rockers D G, sawJ, attached thereto, as shown, and the bars E H, the latter beingconnected to the rockers and to the fixtures F I, and all arrangedsubstantially as THos. S. J. DOUGLAS, GEO. W. REED.

